<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <style>
    p.box{
      color: red;
    }
  </style>
</head>
<body>

<p class="box">这是p标签</p>
<p>ppppppp</p>
<div class="box">这是div标签</div>




</body>
</html>
